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The use of small diameter piping in a system increases the speed at which the air moves. The speed of the air can
pull water uphill and, at sufficient velocity, it can actually move water vertically up the side walls of the pipe. This
has the potential of creating a problem in the negative pressure (inlet) side piping. For HS Series Fan inlet piping,
the following table provides the minimum recommended pipe diameters as well as minimum pitch under several
system conditions. Use this chart to size piping for a system.
RISE
All exhaust piping should be 2" PVC.
1.6 SYSTEM MONITOR & LABEL
A properly designed system should incorporate a "System On" indicator for affirmation of system operation. A
Magnehelic pressure gauge is recommended for this purpose. The indicator should be mounted at least 5 feet
above the slab penetration to minimize the risk of filling the gauge with water in installations with occasional high
water tables. A System Label (P/N 15022) with instructions for contacting the installing contractor for service
and also identifying the necessity for regular radon tests to be conducted by the building occupants, must be
conspicuously placed where the occupants frequent and can see the label.
1.7 SLAB COVERAGE
The HS Series Fan can provide coverage of well over 1000 sq. ft. per slab penetration. This will, of course, depend
on the sub-slab aggregate in any particular installation and the diagnostic results. In general, sand and gravel are
much looser aggregates than dirt and clay. Additional suction points can be added as required. It is recommended
that a small pit (5 to 10 gallons in size; larger as needed) be created below the slab at each suction hole. When
fine sand or dirt is present it is recommended that the pit be lined with a material such as clean gravel, size 4, 5,
56, or 6 as classified (ASTM C33).
1.8 ELECTRICAL WIRING
For models with a cord, the HS Series Fan plugs into a standard 120V outlet. The switch box models are
hardwired. All wiring must be performed in accordance with the National Fire Protection Association's
(NFPA)"National Electrical Code, Standard #70"-current edition for all commercial and industrial work, and state
and local building codes. All wiring must be performed by a qualified and licensed electrician. Outdoor installations
require the use of a UL listed watertight conduit. Ensure that all exterior electrical boxes are outdoor rated and
properly caulked to prevent water penetration into the box. A means, such as a weep hole, is recommended to
drain the box.
1.9 SPEED CONTROLS
Electronic speed controls can NOT be used on HS Series units.
IN007 Rev N 0419
Pipe
Diameter
4"
RUN
3"
*Typical operational flow rates:
HS2000 12 - 63 CFM
HS3000 19 - 39 CFM
HS5000 16 - 44 CFM
3 Saber Way, Ward Hill, MA 01835 | radonaway.com
Minimum Rise per 1 Foot of Run*
@ 25 CFM
@ 50 CFM
1/32"
3/32"
1/8"
3/8"
@ 100 CFM
3/8"
1 1/2"
4
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